渤海海域北部JX1-1反转构造与油气成藏关系

Relationship between JX1-1 Inversion Tectonics and Hydrocarbon Accumulation of the Northern Offshore Bohai Bay Basin

以高分辨率三维地震资料为基础,结合相干技术等先进地震资料处理和解释技术,对研究区反转构造变形特征进行了探讨和研究,并分析了反转带与油气聚集的关系。JX1-1地区断裂发育,主要为NE走向,平面上呈雁列式排列。在古近系沙河街组沉积末期,JX1-1地区在郯庐断裂走滑应力作用下发生了反转,形成了良好的背斜构造背景,在古近系东营组沉积时期,持续隆升,到了古近纪末期和新近纪初期,基本定型。JX1-1反转带的发育对油气聚集成藏的影响主要表现为:有利于构造圈闭的形成;对沉积体系的展布形成了一定的影响;形成的断裂有助于油气的运移;对储层的物性起到积极的改善作用;反转强度过大对新近系浅层油气聚集不利;渤海海域郯庐断裂带过渡、拐弯部位的反转构造带古近系是有利的油气勘探目标区带。

Based on the high-resolution 3-D seismic profiles and combined with coherent technology and other advanced seismic data processing as well its interpretation techniques,we discussed and studied the deformation characteristics of the inversion in the JXI-1 area,and analyzed the relationship between JXI-1 in version tectonics and hydrocarbon accumulation in Liaodongwan offshore of Bohai Bay basin. There are numerous faults of varying scales in JXI-1 area,and the NE-trending faults are predominant. Too large inver sion is not favorable for the shallow hydrocarbon accumulation in Neogene. The Tan-I.u fault＇s transition and turning parts of the Paleogene inversion tectonics zone are the favorable objectives for oil and gas ex ploration in the offshore Bohai Bay basin. JX1-1 region in the Tan-Lu strike-slip fault stresses under the effect of reversal,during the late sedimentary periods of the Paleogene Shahejie Formation, forming a good anticline structure. In the Paleogene Dongying Formation deposition period,it continued to uplift,until the late Paleogene and early Neogene inversion structures have been formed. The JXl-1 inversion tectonics had also significant influences on the formation of the structural traps,spatial distribution of sedimentary sys tems and hydrocarbon migration,as well as improvement on reservoir properties.